KShare/recording/encoders/encoder.cpp

152 lines
5.3 KiB
C++

#include "encoder.hpp"
#include <settings.hpp>
extern "C" {
#include <libavutil/imgutils.h>
#include <libavutil/opt.h>
}
inline void throwAVErr(int ret, std::string section) {
char err[AV_ERROR_MAX_STRING_SIZE];
av_make_error_string(err, AV_ERROR_MAX_STRING_SIZE, ret);
std::string newString(err);
throw std::runtime_error("Error during: " + section + ": " + newString);
}
#define OR_DEF(s, e1, e2) s ? s->e1 : e2
Encoder::Encoder(QString &targetFile, QSize res, CodecSettings *settings) {
int ret;
// Format
ret = avformat_alloc_output_context2(&fc, NULL, NULL, targetFile.toLocal8Bit().constData());
if (ret < 0) throwAVErr(ret, "format alloc");
// Stream
out->st = avformat_new_stream(fc, NULL);
if (!out->st) throw std::runtime_error("Unable to allocate video context");
out->st->id = fc->nb_streams - 1;
if (fc->oformat->flags & AVFMT_GLOBALHEADER) fc->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
av_dump_format(fc, 0, targetFile.toLocal8Bit().constData(), 1);
// Codec
if (!fc->oformat->video_codec) throw std::runtime_error("Video codec not found");
codec = avcodec_find_encoder(fc->oformat->video_codec);
if (!codec) throw std::runtime_error("Video codec not found");
out->enc = avcodec_alloc_context3(codec);
if (!out->enc) throw std::runtime_error("Unable to allocate video context");
int fps = settings::settings().value("recording/framerate", 30).toInt();
out->enc->codec_id = codec->id;
out->enc->codec = codec;
out->enc->bit_rate = OR_DEF(settings, bitrate, 400000);
out->enc->width = res.width() % 2 ? res.width() - 1 : res.width();
out->enc->height = res.height() % 2 ? res.height() - 1 : res.height();
size = QSize(out->enc->width, out->enc->height);
out->st->time_base = { 1, fps };
out->enc->time_base = out->st->time_base;
out->enc->gop_size = OR_DEF(settings, gopSize, 12);
out->enc->pix_fmt = AV_PIX_FMT_YUV420P; // blaze it
AVDictionary *dict = NULL;
if (out->enc->codec_id == AV_CODEC_ID_GIF)
out->enc->pix_fmt = AV_PIX_FMT_RGB8;
else if (out->enc->codec_id == AV_CODEC_ID_H264 || out->enc->codec_id == AV_CODEC_ID_H265) {
av_dict_set(&dict, "preset", settings->h264Profile.toLocal8Bit().constData(), 0);
av_dict_set_int(&dict, "crf", OR_DEF(settings, h264Crf, 12), 0);
} else if (out->enc->codec_id == AV_CODEC_ID_VP8 || out->enc->codec_id == AV_CODEC_ID_VP9)
av_dict_set_int(&dict, "lossless", OR_DEF(settings, vp9Lossless, false), 0);
ret = avcodec_open2(out->enc, codec, &dict);
av_dict_free(&dict);
if (ret < 0) throwAVErr(ret, "codec open");
if (codec->capabilities & AV_CODEC_CAP_DR1) avcodec_align_dimensions(out->enc, &out->enc->width, &out->enc->height);
ret = avcodec_parameters_from_context(out->st->codecpar, out->enc);
if (ret < 0) throwAVErr(ret, "stream opt copy");
// Frames
out->frame = av_frame_alloc();
if (!out->frame) {
throw std::runtime_error("frame alloc");
}
out->frame->format = out->enc->pix_fmt;
out->frame->width = out->enc->width;
out->frame->height = out->enc->height;
ret = av_frame_get_buffer(out->frame, 32);
if (ret < 0) throwAVErr(ret, "frame buffer alloc");
// Writer
ret = avio_open(&fc->pb, targetFile.toLocal8Bit().constData(), AVIO_FLAG_WRITE);
if (ret < 0) throwAVErr(ret, "writer open");
ret = avformat_write_header(fc, NULL);
if (ret < 0) throwAVErr(ret, "write header");
success = true;
}
void Encoder::setFrameRGB(uint8_t *rgb) {
int ret = av_frame_make_writable(out->frame);
if (ret < 0) throwAVErr(ret, "setFrameRGB");
int lineSize[1] = { 3 * out->enc->width };
out->sws = sws_getCachedContext(out->sws, out->enc->width, out->enc->height, AV_PIX_FMT_RGB24, out->enc->width,
out->enc->height, (AVPixelFormat)out->frame->format, 0, 0, 0, 0);
sws_scale(out->sws, (const uint8_t *const *)&rgb, lineSize, 0, out->enc->height, out->frame->data, out->frame->linesize);
out->frame->pts = out->nextPts++;
}
Encoder::~Encoder() {
end();
}
bool Encoder::addFrame(QImage frm) {
if (!success) return false;
if (frm.size() != size) frm = frm.copy(QRect(QPoint(0, 0), size));
if (frm.format() != QImage::Format_RGB888) frm = frm.convertToFormat(QImage::Format_RGB888);
uint8_t *frameData = (uint8_t *)frm.bits();
setFrameRGB(frameData);
AVPacket pkt;
pkt.size = 0;
pkt.data = NULL;
av_init_packet(&pkt);
int gotPack = 0;
int ret = avcodec_encode_video2(out->enc, &pkt, out->frame, &gotPack);
if (ret < 0) {
av_packet_unref(&pkt);
throwAVErr(ret, "encode video");
}
if (gotPack) {
av_packet_rescale_ts(&pkt, out->enc->time_base, out->st->time_base);
pkt.stream_index = out->st->index;
ret = av_interleaved_write_frame(fc, &pkt);
} else
ret = 0;
av_packet_unref(&pkt);
if (ret < 0) throwAVErr(ret, "write frame");
return true;
}
bool Encoder::isRunning() {
return success;
}
bool Encoder::end() {
if (!success) {
goto cleanup;
}
av_write_trailer(fc);
cleanup:
avcodec_free_context(&out->enc);
av_frame_free(&out->frame);
sws_freeContext(out->sws);
delete out;
if (!(fc->oformat->flags & AVFMT_NOFILE)) //
avio_closep(&fc->pb);
avformat_free_context(fc);
return success;
}